Windows 10: UEFI/GPT- based hard drive partitions for win10

I did the reinstall of windows 10 without booting, from the windows 10 setup, a question a couple months ago it was easy, keeping my files and applications, my problem started happening when I couldn't finish updates. I have a UEFI system and I learned that my first partition is the EFI system partition, it's formatted for Fat32 and it should be 200 MB minimun size, mine is 100MB, then comes the MSR partition the Microsoft Reserved which is 16 MB, the next partition is my C: or windows partition formatted NTFS, the next partition is the windows recovery environment and is at least 300MB. I f

:)

 

Solving the free space problem on "microsoft system reserved partition " to Win10 upgrading

it should be easier to work with UEFI/GPT for upgrading to win10

win10 UEFI/GPT-based hard drive partitions info;

https://msdn.microsoft.com/windows/...-drive-partitions?f=255&MSPPError=-2147217396

 

Windows 10 installation on 4tb hdd on GPT partition with UEFI mode system.

Hi Troy,



I realize the inconvenience you are experiencing with Windows 10. I will certainly help you.



This issue might occur if Windows 10 is not correctly in GPT partition with UEFI mode.

I suggest you to refer to the suggestion provided in the Microsoft Help Article and try to install Windows 10 in GPT partition. Check if it helps.

Windows Setup: Installing using the MBR or GPT partition style

Please get back to us with an update on issue with missing hard drive space of 2 TB in the hard disk after installing Windows 10, we will be happy to help.



Thank you.

 

Changed to gpt and uefi bios, now windows wont boot

Emil Gyldenskog Nøsavik

Thank you for posting in the Microsoft community.

When a MBR hard disk is converted to GPT, if you can't get into the system, it's usually due to incorrect BIOS settings or no UEFI boot. Here are the steps to solve this problem:

1. Enter PE system: Use a USB flash drive to boot and enter the PE system (pre-installation environment) to make sure the data is normal.
   
2. Check the BIOS settings:
   
   • Make sure UEFI boot is set in BIOS.
     
   • If the BIOS is set to UEFI boot, but the partition is still MBR partition, you need to modify the BIOS settings to match the hard disk partition mode and boot mode.
     
3. Use a PE tool that supports UEFI: Make sure the PE tool you use supports UEFI repair boot.
   
4. Create an EFI system partition:
   
   • In PE system, open "Disk Management", find the SSD (usually labeled as "Disk 1"), right-click and select "Compress Volume" to compress about 500MB of space.
     
   • Open a command prompt, type `diskpart` and enter.
     
   • Use the `select disk` command to select the SSD.
     
   • Use the `create partition efi` command to create the EFI system partition.
     
   • Format the EFI partition using the `format fs=fat quick` command.
     
   • Use the `assign` command to assign a drive letter to the EFI partition.
     
5. Bootstrap Repair:
   
   • In a command prompt window, type `bcdboot x:\windows /s y: /f uefi`, where `x` is the drive letter where the system is located in the SSD and `y` is the drive letter of the EFI partition.
     

Hope the above information can help you



Best Wish

Shawn Z | Microsoft Community Support Specialist